- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-07-2021 08:29 AM
I have build the topology for this and for some reason the router ospf1on the left leg is not doing anythingI just need help on the left leg here is what I've done so far
Build the following network. (multi area OSPF, VLANs)
5 Routers with serial ports (router 0 connects to R1 and R2. R1 connects to R3. R2 connects to R4)
1 switch connects to R4 and 1 switch connects to R3.
2 Switches (switch is attached to last router in the network)
1 end device attached to each switch
Subnet the addresses for the device requirement
Configure all routers with Loopback0 and router-ID
Configure sub interfaces on router connected to switches.
Routers at the top of the network are Area 0
Network Leg A: Area 1
192.168.100.0/24; network host requirement is 100 devices
VLAN 100
Network Leg B: Area 2
172.16.20.0/22; network host requirement is 50 devices
VLAN 200
Configure mulit area OSPF and ping successfully from Leg A to Leg B.
Solved! Go to Solution.
- Labels:
-
Other Community Feedback
Accepted Solutions
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-08-2021 02:25 AM
Hello
@Bunny12375 wrote:
Configure mulit area OSPF and ping successfully from Leg A to Leg B.
PT is quite restrictive in what feature you can use, however attached is a working PT file with multiple ospf areas along with the a txt file with the configuration applied.
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-07-2021 08:54 AM
Hello @Bunny12375,
an OSPF multiarea design requires that:
area 0 or 0.0.0.0 to be in the center of the network
all other areas need to be connected to area 0 via an ABR Area Border Router : a device that has an active link in area 0 and at least one link in the other area.
Check using
show ip ospf neighbors
show ip ospf database
what can be your issue.
Likely you have an ABR node with no link to area 0 . If this happens even if the device has links in two different areas it will not act as an ABR.
Or you have an area with no direct connection to area 0.
Hope to help
Giuseppe
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-07-2021 12:13 PM
Hello,
your network needed a lot of changes/adjustments. You were:
- missing all loopbacks
- missing all WAN (serial interface) IP addressing
- OSPF was misconfigured (or not configured at all) on all routers
Review the attached PT file (saved in version 8), with the changes implemented, and full end to end connectivity.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-07-2021 02:49 PM
I tried configuring it at first but it wasn't doing anything maybe i just messed my subnetting and was able to get it working but also thanks for the help!
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-08-2021 02:25 AM
Hello
@Bunny12375 wrote:
Configure mulit area OSPF and ping successfully from Leg A to Leg B.
PT is quite restrictive in what feature you can use, however attached is a working PT file with multiple ospf areas along with the a txt file with the configuration applied.
Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.
Kind Regards
Paul
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
04-09-2021 12:35 PM
Thanks for this I actually used it as a guide trying to do the homework on my own I appreciate the notes that came along with it!
